On Mon, 07 Oct 2024 22:39:09 +0000, Oliver Upton wrote:
> Alex reports that syzkaller has managed to trigger a use-after-free when
> tearing down a VM:
>
> BUG: KASAN: slab-use-after-free in kvm_put_kvm+0x300/0xe68 virt/kvm/kvm_main.c:5769
> Read of size 8 at addr ffffff801c6890d0 by task syz.3.2219/10758
>
> CPU: 3 UID: 0 PID: 10758 Comm: syz.3.2219 Not tainted 6.11.0-rc6-dirty #64
> Hardware name: linux,dummy-virt (DT)
> Call trace:
> dump_backtrace+0x17c/0x1a8 arch/arm64/kernel/stacktrace.c:317
> show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
> __dump_stack lib/dump_stack.c:93 [inline]
> dump_stack_lvl+0x94/0xc0 lib/dump_stack.c:119
> print_report+0x144/0x7a4 mm/kasan/report.c:377
> kasan_report+0xcc/0x128 mm/kasan/report.c:601
> __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
> kvm_put_kvm+0x300/0xe68 virt/kvm/kvm_main.c:5769
> kvm_vm_release+0x4c/0x60 virt/kvm/kvm_main.c:1409
> __fput+0x198/0x71c fs/file_table.c:422
> ____fput+0x20/0x30 fs/file_table.c:450
> task_work_run+0x1cc/0x23c kernel/task_work.c:228
> do_notify_resume+0x144/0x1a0 include/linux/resume_user_mode.h:50
> el0_svc+0x64/0x68 arch/arm64/kernel/entry-common.c:169
> el0t_64_sync_handler+0x90/0xfc arch/arm64/kernel/entry-common.c:730
> el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
>
> [...]
Applied to fixes, thanks!
[1/1] KVM: arm64: Unregister redistributor for failed vCPU creation
commit: ae8f8b37610269009326f4318df161206c59843e
Cheers,
M.
--
Without deviation from the norm, progress is not possible.
